<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            /* 居中 */
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

        .grey {
            color: grey;
        }

        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .container .row input {
            width: 260px;
            height: 30px;
        }

        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>留言板</h1>
        <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
        <div class="row">
            <span>谁:</span> <input type="text" name="" id="from">
        </div>
        <div class="row">
            <span>对谁:</span> <input type="text" name="" id="to">
        </div>
        <div class="row">
            <span>说什么:</span> <input type="text" name="" id="say">
        </div>
        <input type="button" value="提交" id="submit" onclick="submit()">
        <!-- <div>A 对 B 说: hello</div> -->
    </div>

    <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
    <script> 
        $.ajax({
            url:"/message/getList",
            type:"get",
            success:function(messageInfos){
                var finalHtml = "";
                for(var message of messageInfos){
                    finalHtml+='<div>'+message.from+'对'+message.to+'说：'+message.message+'</div>';
                }
                $(".container").append(finalHtml);
            }
        })
        function submit(){//从文本中获取文本内容放到表白墙上
            //1.获取留言内容
            var from = $("#from").val();
            var to = $("#to").val();
            var say = $("#say").val();
            /* if (from==''||to==''||say=='') {
                return;
            } */
            //发送ajax请求
            $.ajax({
                url:"message/publish",
                type:"post",
                data:{
                    from:$("#from").val(),
                    to:$("#to").val(),
                    message:$("#say").val()
                },
                success:function(result){
                    if (result) {
                        //2.构造节点
                        var content = "<div>"+ from + "对" + to + "说: " + say +"</div>";
                        console.log(content);
                        //3.把节点放在页面上
                        $(".container").append(content);//放到表白墙
                        //4.重置输入框
                        $("#from").val("");
                        $("#to").val("");
                        $("#say").val("");
                        
                    }else{
                        alert("不合法")
                    }

                }
            })
            
        }
        
    </script>
</body>

</html>